Dr. Bruce Siegel, the group’s president and CEO, said in a statement the bill “would shift costs to states, patients, providers, and taxpayers.”

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“Further, by taking an approach so close to that of the earlier House and Senate plans, it’s reasonable to conclude it would have a similar result: millions of Americans losing coverage,” he added.

America’s Essential Hospitals is one of the first major health groups to come out in opposition to the bill. Most have not yet weighed in on the measure, which was only introduced on Wednesday.

Many are also skeptical of the bill’s chances, but it appears to be gaining at least some momentum.

Cassidy told reporters Friday that he thought the bill had the support of 48-49 senators, just shy of the needed 50. Still, the effort faces long odds and a fast-approaching procedural deadline of Sept. 30.

America’s Essential Hospitals was one of the most outspoken opponents of the earlier repeal bills, along with other hospital groups. Many doctors groups were also opposed and many insurers eventually weighed in against provisions to change ObamaCare pre-existing condition rules.